The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 12, 1988
Filed:
Dec. 10, 1986
Kanji Tanaka, Gunma, JP;
Masashi Arai, Gunma, JP;
Sanyo Electric Co., Ltd., , JP;
Abstract
In an AM stereo receiving apparatus for decoding an AM stereo broadcasting signal of an ISB system, an envelope detecting circuit 6 detects an output of an intermediate frequency amplifying circuit 5 and a DC removing circuit 7 removes a DC component therefrom, so that a stereo sum signal (L+R) is obtained. A quadrature detecting circuit 9 detects quadrature of the output of the intermediate frequency amplifying circuit 5. A multiplying circuit 10 multiplies the stereo sum signal (L+R), which is amplified a times as much by a first amplifying circuit 8, and the output of the quadrature detecting circuit 9. An addition circuit 12 adds the output of the quadrature detecting circuit 9, which is amplified b times as much by a second amplifying circuit 11, and the output of the multiplying circuit 10. The output of the addition circuit 12 becomes a stereo difference signal (L-R) by appropriately setting the amplification factor a of the first amplifying circuit 8 and the amplification factor b of the second amplifying circuit 11.